Jim Duggan says it's hard to sleep. He drives people around Boston every day and likes to strikes up conversations with the people in the back seat.

On the day before the marathon, Duggan picked up two young men at the Malden Train Station.

"They said, 'Can you take us to Cambridge?' I said, 'No problem.' I opened the trunk. They had two backpacks. I reached out to help them put them in the trunk, and they wanted to put it in themselves," Jim Duggan said.

Duggan is convinced that he drove Tamerlan and Dzhokhar Tsarnaev the night before the Marathon bombings. Duggan made small talk with the brothers, asking where they were from. They said Chechnya.

"I said, 'Hey, guys, I don't know if you've heard of the Boston Marathon because it's tomorrow. Like right over the bridge. If you've never seen it -- might be a good experience, right? Something for you to see.' And the littler brother said like, 'Oh, Boston Marathon?' And then the older brother got real aggressive," Duggan said.

Duggan said he dropped off the Tsarnaevs near their home. He starting driving off, forgetting their backpacks in his trunk. They banged on the car. Duggan stopped, popped the trunk and helped them with their backpacks, which he said were a lot heavier than he expected.

"The thought that I picked up what actually could have been that bag is terrifying," Duggan said.

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